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mark_m

Extra slow firing schedule for heavy pots

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I'm firing an L&L kiln with an LT3140 controller. Am not acclimated to these digital controllers and am firing a somewhat precious load with pieces up to 1/2" thick walls and some going to 1" on the feet. I want a very conservative schedule to be on the safe side. Have had problems in the past with the default slow bisque schedule.  Here is what I'm thinking:

180 rate 50 hold 8 hrs

210 rate 15 hold 1

213 rate 1.5 hold 1

650 rate 150

700 rate 50

1050 rate 150

1100 rate 80

1655 rate 150

Cone 06 rate 80 hold 1

This will be my first programmed schedule - part of me still wishes I just had knobs to turn but I know this will be so much more convenient when I'm used to it... Thanks for any thoughts!

-Mark M

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I don't think you're going to get any benefit in climbing super slow from 180 to 213. You're also putting too much faith in the ability of a controller to do super slow climbs. You might get regular temperature differences of 15 degrees during any climb. I wouldn't mess with rates less than 50 degrees per hour. Slower than that you're just wasting time. Better to get to the temp and hold. I would just do a long preheat at 180F, then climb at 75/hour all the way up. It will take about 24 hours after the preheat, but better safe than sorry.

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Thanks Neil. I am running a program kind of integrating your feedback with my schedule, i.e. still slowing down a bit more for chemically combined water and quartz inversion. Thanks very much for your thoughts!

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